Check what kind of plastic it is made from. Mine appear to be #2 (HDPE). According to the research I've done this kind of plastic doesn't leach BPA, and it doesn't appear there are any known health concerns associated with it.
Type 3 plastic is PVC, which is the kind of plastic for which there are concerns regarding bisphenol a. BPA may be used in the manufacture of PVC products as a plasticizer, and polycarbonate plastics (#7) are made from BPA. The compound bisphenol a is organic (contains carbon) and has two phenol functional groups. Phenolic compounds are various and prevalent in nature and in plants. Apparently bisphenol a exhibits weak hormone-like effects in humans, mimicking estrogen, as an endocrine-disruptor, may disrupt the thyroid, etc.
I read one article that stated BPA is taken up by plant roots, metabolized in certain was and then distributed into plant tissues. The research determined that at the right concentration, BPA acted as cytokinin-like compound (plant hormone), stimulating growth and shoot differentiation (in carrots).
I would just avoid #3 and #7 plastics.